CVE-2026-1856
Received Received - Intake
Stored XSS in Appointment Booking Calendar WordPress Plugin

Publication date: 2026-06-19

Last updated on: 2026-06-19

Assigner: Wordfence

Description
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Meta Information
Published
2026-06-19
Last Modified
2026-06-19
Generated
2026-06-19
AI Q&A
2026-06-19
EPSS Evaluated
N/A
NVD
CVE-2026-1856
EUVD
EUVD-2026-37980
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wpbookingcalendar appointment_booking_calendar to 1.4.4 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Impact Analysis

This vulnerability can allow attackers with certain access privileges to inject malicious scripts that execute in the browsers of users who visit the infected pages.

  • It can lead to theft of user credentials or session tokens.
  • It may enable attackers to perform actions on behalf of users without their consent.
  • It can result in defacement or manipulation of website content.
Executive Summary

The Appointment Booking Calendar plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.4.4. This vulnerability arises because the plugin does not properly sanitize or escape input in custom booking field labels.

As a result, authenticated users with Author-level access or higher can inject malicious web scripts into pages. These scripts will execute whenever any user accesses the affected page, potentially compromising user security.

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